Long-sieve machine for the manufacture of multiple-web papers and cardboard



March 31, 1931. p, ERKENS 1,799,092

LONG SIEVE MACHINE FOR THE MANUFACTURE OF MULTIPLE WEB PAPERS AND CARDBOARD Filed Sept. 21, 1927 A 5 a j 7 6 5 fnvenzor; fizul Efkmy jy-fidd,wmm/w Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE PAUL ERKENS, OF DUREN, GERMANY LONG-SIEVE MACHINE FOR THE MANUFACTURE OF MULTIPLE-WEB PAPERS AN CARDBOARD I Application filed September 21, 1927, Serial No. 221,092, and in Germany November 21, 1924.

This invention has reference to long-sieve machines or so-called Fourdrinier-machines and in particular to machines of this kind, as employed in the manufacture of cardboard or paste board or multiple-web papers h and it is intended to facilitate the manipulation and increase the output of such machines and to generally improve the operation therer of. Paper machines of this general descrip tion have become known from the previous art in which the several webs of paper were combined at the couchingpoints or shortly before reaching these points. Machines of this general operation were constructed on the principle of the s c-called duplex and triplex machines; In view however of the fact that the shaking of the long-sieve does not,

take place at the couching points, it is obvious that the felting of the several webs of paper at their points of combination could not be 3 ing portion of the long-sieve proper. In connection there with it has been found to be advantageous to so arrange the several longsieve units as to cause them to be shaken at the same ratio and parallel with relationto the longsieve proper, and in furtherpursuance of my invention the compensating shaking of the long-sieve is effected only at the rear of the last unit.

The invention will be more fully described by way of exemplification of its general principles by reference to the accompanying drawing illustrating diagrammatically and in front elevation in Figure 1 the general arrangement of the principal constituent parts of the machine. FigureQ is a plan view of Fig. 1. r

Above the usual long-sieve l-several machine-sieve units are disposed. In the exemplification shown three such units are employed and designated respectively 2, 3, 4.

The units are substantially duplicates of each other and comprise each the two rolls 5 and 6 and an endless long-sieve 7 and combined with the necessary suction boxes 8 and other appurtenances, a delivery table and so on 55 which latter members have not been shown in I the drawing. Below the point at the longsieve 1 which is in contact with the roller 5 of the upper machine-unit and which constitutes the couching point a suction member so 9 is arranged, in order to obtain an unobjectlonable couching of the web. In front of the breast roll 10 of the long-sieve 1 a cardboard forming roller with delivery table 11 is arranged. The guiding bars of the lower long-sieve 1 are divided behind the last unit 4 and the two rolls 12 constitute the pressing rolls of the sieve at the dividing point. The shaking is so'arranged that the supporting bars of the frame section underneath the units 2, 3 and 4 and the section of the longsieve 1 carriedthereby are'shaken in the parallel direction and at the same'ratio as the machine units2', 3 .and 4 above the long-sieve. The' section of the bars behind the two rollers 12 effects a compensating shaking operation in the well known manner. The units 2, 3 and 4 arearranged only above that part of the long-sieve 1 where the shaking takes place in the parallel-direction and by this means a so uniform couching across the entire width of the web -of paper is accomplished. v

The machine in accordance with this general description is particularly intendedto -serve for the manufacture of multiple-web '35 paper or card-board by causing the several webs to be couched in superimposed relation upon each other; If it is intended for instance to manufacture bag paper, the machine unit 2 may be employed for' instance, so as to couch a nice white web onto the longsieve 1, while bymeans of the unit 3an in- I ferior intermediate layer is couched upon this web and an additional, for instance blue and high-grade web of paper is couched oif from the last machine unit 4, so as'to obtain a kind of paper or a card-board-like paper with differently colored outsides' and with an intermediate layer or a filling of inferior, low-grade material. It is obvious that I may with the loops.

also employ two machine units, while the first machine unit may for instance be replaced by the forming carriage with delivery table 11. It is also possible in accordance with this invention to manufacture thick, strong-walled card-boards by couching one card-board upon the other in accordance with the number of machine units. The thickness of the card-boards may be .varied as desired and without any danger of the web of card-board dropping off or becoming detached from the long-sieve 1 which serves at the same time as a supporting conveying apron or band and this feature constitutes oneof the important advantages as compared with the machines heretofore constructed in which the web of card-board or paper was couched onto the bottom side of the long-sieve. a a

As a further important advantage of the subject matter of this invention it may be pointed out that by this means it becomes possible to manufacture multiple-web papers and card-boards with interlacingly felted constituent webs and exhibiting very. great tearing strength in the longitudinal as well as in the tranverse direction and at a great economy of space. w

The invention has been 'describedfand illustrated in its broad aspects and general features only, and it should be understood that it is not dependent upon the size and general arrangement of the several parts, ex-

- cept as otherwise stated in the appended claims. Y

I claim 1. In the art of making multiple-web paper, card board and the like, a shakingly disposed, straight, web-supporting longsieve, and a plurality of loop-shaped, shakingly disposed, .web-supportmg sieves,- serially and spacedly arranged in the direction of the long sieve and engaging said long sieve at one point of each of said loops, a guiding and pressing roller within the loops at the point of engagement with the long sieve and engaging the two runs of the loop, and a smallersupporting roller at the other end of each loop, spaced from the long-sieve,

and couching means at the reverse side of the long-sieve at each point of engagement 2. In the art of making multiple-web papers, card board and the like, a longitudinally travelling, shakingly disposed, straight, web-supporting long-sieve, and a plurality of loop-shaped, travelling, Web-supporting sieves, serially and spacedly arranged in the direction of the long-sieve and co-directionally shakable withv relation to the long sieve, and engaging the upper surface of the long-sieve at one point of each of said loops, a guiding and pressing roller'within each of the loops at thepoi'nts of'engagement with the long-sieve longitudinally paratively larger roller.

' PAUL ERKENS. 

